ASAHI KASEI
[AK4522]
M0020-E-01
1998/10
- 1 -
GENERAL DESCRIPTION
The AK4522 has a dynamic range of 100dB and is well-suited middle-range MD, surround system,
musical instruments and car audio. Signal inputs and outputs are single-ended. The DAC outputs are
analog filtered to remove out of band noise. External components are minimized. The AK4522 is
available
in a small 24pin VSOP package, which will reduce system space.
FEATURES
Stereo ADC
- 64x Oversampling
- Sampling Rate Ranging from 16kHz to 48kHz
- S/(N+D): 92dB
- Dynamic Range, S/N: 100dB
- Digital HPF for offset cancellation
Stereo DAC
- 128x Oversampling
- Sampling Rate Ranging from 16kHz to 48kHz
- 2nd order SCF + 2nd order CTF
- Digital de-emphasis for 32kHz, 44.1kHz, 48kHz sampling
- S/(N+D): 90dB
- Dynamic Range, S/N: 100dB
- Soft Mute
High Jitter Tolerance
Master Clock: 256fs, 384fs, 512fs
Analog Power Supply: 4.5 to 5.5V, Digital Power Supply: 2.7 to 5.5V
Small VSOP Package: 24pin VSOP
VA
AGND
VD DGND
CMODE
AINL+
AINL-
AINR+
AINR-
VREFH
VCOM
AOUTL
AOUTR
MCKI
LRCK
SCLK
SDTO
SDTI
DIF0
DIF1
SMUTE
DEM1
DEM0
PD
Modulator
Modulator
Filter
Decimation
Filter
Decimation
HPF
HPF
Common Voltage
LPF
LPF
Modulator
Modulator
Interpolator
8x
Interpolator
8x
Serial I/O
Interface
Clock
Divider
20Bit Stereo
ADC & DAC
AK4522
ASAHI KASEI
[AK4522]
M0020-E-01
1998/10
- 2 -
n
Ordering Guide
AK4522VF
-10
+70
C
24pin VSOP (0.65mm pitch)
AKD4522
Evaluation Board for AK4522
n
Pin Layout
6
5
4
3
2
1
VREFH
AINR+
AINL+
AINR-
AINL-
VA
AGND
7
DIF0
8
VCOM
AOUTR
AOUTL
CMODE
PD
DGND
VD
MCKI
Top
View
10
9
DIF1
LRCK
SCLK
11
SDTI
12
DEM1
DEM0
SMUTE
SDTO
19
20
21
22
23
24
18
17
15
16
14
13
ASAHI KASEI
[AK4522]
M0020-E-01
1998/10
- 3 -
PIN/FUNCTION
No.
Pin Name
I/O
Function
1
VREFH
I
Positive Voltage Reference Input Pin, VA
Used as a positive voltage reference by ADC & DAC. VREFH should be connected
externally to filtered VA.
2
AINR+
I
Rch Analog Positive Input Pin
3
AINR-
I
Rch Analog Negative Input Pin
4
AINL+
I
Lch Analog Positive Input Pin
5
AINL-
I
Lch Analog Negative Input Pin
6
VA
-
Analog Power Supply Pin
7
AGND
-
Analog Ground Pin
8
DIF0
I
Audio Data Interface Format Pin
9
DIF1
I
Audio Data Interface Format Pin
10
LRCK
I
Input/Output Channel Clock Pin
11
SCLK
I
Audio Serial Data Clock Pin
12
SDTI
I
Audio Serial Data Input Pin
13
SDTO
O
Audio Serial Data Output Pin
14
SMUTE
I
Soft Mute Pin
When this pin goes "H", soft mute cycle is initiated.
When returning "L", the output mute releases.
15
DEM0
I
De-emphasis Frequency Select Pin
16
DEM1
I
De-emphasis Frequency Select Pin
17
MCKI
I
Master Clock Input/X'tal Input Pin
18
VD
-
Digital Power Supply Pin
19
DGND
-
Digital Ground Pin
20
PD
I
Reset Pin
21
CMODE
I
Master Clock Select Pin (Internal Biased pin)
"H": 384fs, "L": 256fs, "NC": 512fs
22
AOUTL
I
Lch Analog Output Pin
23
AOUTR
I
Rch Analog Output Pin
24
VCOM
O
Common Voltage Output Pin, VA/2
Note: All input pins except pull-down pins should not be left floating.
ASAHI KASEI
[AK4522]
M0020-E-01
1998/10
- 4 -
ABSOLUTE MAXIMUM RATINGS
(AGND DGND=0V; Note 1)
Parameter
Symbol
min
max
Units
Power Supplies
Analog
Digital
|AGND-DGND| (Note 2)
VA
VD
GND
-0.3
-0.3
-
6.0
6.0
0.3
V
V
V
Input Current, Any Pin Except Supplies
IIN
-
10
mA
Analog Input Voltage
VINA
-0.3
VA+0.3
V
Digital Input Voltage
VIND
-0.3
VD+0.3
V
Ambient Temperature (power applied)
Ta
-10
70
C
Storage Temperature
Tstg
-65
150
C
Note:1. All voltages with respect to ground.
2. AGND and DGND must be same voltage.
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS
(AGND, DGND=0V; Note 1)
Parameter
Symbol
min
typ
max
Units
Power Supplies
(Note 3)
Analog
Digital
VA
VD
4.5
2.7
5.0
5.0
5.5
VA
V
V
Note:1. All voltages with respect to ground.
3. The power up sequence between VA and VD is not critical.
*AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
ASAHI KASEI
[AK4522]
M0020-E-01
1998/10
- 5 -
ANALOG CHARACTERISTICS
(Ta=25
C; VA, VD=5V; AGND, DGND=0V; VREFH=VA; fs=44.1kHz; SCLK=64fs;
Signal Frequency =1kHz; 20bit Data; Measurement Frequency=10Hz
20kHz; unless otherwise specified)
Parameter
min
typ
max
Units
ADC Analog Input Characteristics: Differential Inputs; Analog Source Impedance=470
Resolution
20
Bits
S/(N+D) (-0.5dB Input) (Note 4)
84
92
dB
DR (-60dB Input, A-Weighted) (Note 5)
94
100
dB
S/N (A-Weighted) (Note 5, 6)
94
100
dB
Interchannel Isolation
90
110
dB
Interchannel Gain Mismatch
0.1
0.3
dB
Gain Drift
20
ppm/
C
Input Voltage (AIN=0.6 x VREFH) (Note 7)
2.85
3.0
3.15
Vpp
Input Resistance
20
30
k
Power Supply Rejection (Note 8)
50
dB
DAC Analog Output Characteristics:
Resolution
20
Bits
S/(N+D)
80
90
dB
DR (-60dB Output, A-Weighted) (Note 5)
95
100
dB
S/N (A-Weighted) (Note 6, 9)
95
100
dB
Interchannel Isolation
90
110
dB
Interchannel Gain Mismatch
0.2
0.5
dB
Gain Drift
20
ppm/
C
Output Voltage (AOUT=0.6 x VREFH)
2.65
2.9
3.15
Vpp
Load Resistance
5
k
Load Capacitance
25
pF
Power Supply Rejection (Note 8)
50
dB
Power Supplies
Power Supply Current (VA=VD=5V)
Analog, VA PD ="H"
42
55
mA
Digital, VD PD ="H"
10
20
mA
Note: 4. In case of single ended input, S/(N+D)=80dB(typ, @VA=5V).
5. In case of 16bit, DR and S/N of ADC are 98dB. DR of DAC is 98dB.
6. S/N measured by CCIR-ARM is 96dB at each converter and 94dB at ADC to DAC loopback.
7. Full scale input for each AIN+/- pin is 1.5Vpp in differential mode.
8. PSR is applied to VA, VD with 1kHz, 50mVpp. VREFH pin is held a constant voltage.
9. As the input data is "0", S/N is 100dB regardless of resolution.
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